Horizontal molecular orientation in solution-processed organic light-emitting diodes

Journal Article · Mon Feb 09 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4907890· OSTI ID:22412624

Zhao, L.; Inoue, M. ^[1]; Komino, T. ^[1]; Kim, J. -H. ^[1]; others, and

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1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395 (Japan)

Horizontal orientation of the emission transition dipole moments achieved in glassy vapor-deposited organic thin films leads to an enhancement of the light out-coupling efficiency in organic light-emitting diodes (OLEDs). Here, our combined study of variable angle spectroscopic ellipsometry and angle dependent photoluminescence demonstrates that such a horizontal orientation can be achieved in glassy spin-coated organic films based on a composite blend of a heptafluorene derivative as a dopant and a 4,4′-bis(N-carbazolyl)-1,1′-biphenyl as a host. Solution-processed fluorescent OLEDs with horizontally oriented heptafluorene emitters were then fabricated and emitted deep blue electroluminescence with an external quantum efficiency as high as 5.3%.

• OSTI ID: 22412624
• Journal Information: Applied Physics Letters, Vol. 106, Issue 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BIPHENYL
COUPLING
DIPOLE MOMENTS
ELECTROLUMINESCENCE
ELLIPSOMETRY
FLUORESCENCE
LIGHT EMITTING DIODES
MATHEMATICAL SOLUTIONS
ORIENTATION
PHOTOLUMINESCENCE
QUANTUM EFFICIENCY
SPIN
THIN FILMS
VAPOR DEPOSITED COATINGS
VISIBLE RADIATION